Table 2.

¹³C (150 MHz) and ¹H NMR (600 MHz) data of compound 15.

	δC	δH (J in Hz)	HMBC (H→C) Correlations
1	136.2	-
2	113.8	-
3	130.5	-
4	126.6	7.67, s	C-1, C-2, C-4, C-4a, C-8a, C-9, C-10
4a	133.6	-
5	112.4	7.34, s	C-4, C-8a, C-6, C-7
6	151.3	-
7	150.2	-
8	111.5	8.30, s	C-1, C-4a, C-6, C-7
8a	124.5	-
9	172.1
10	162.4	-
1′	111.5	-
2′	144.0	-
3′	104.5	6.91, s	C-1, C-1′, C-2′, C-4′, C-5′
4′	149.6	-
5′	147.1	-
6′	113.8	8.02, s	C-1, C-1, C-2′, C-4′, C-5′
1″	62.8	4.43, q (7.0)	C-9, C-2″
2″	14.2	1.41, t (7.0)	C-1″